Dear Ute and Roy,
Thank you for your careful consideration and deliberation on my proposal.  I 
would be satisfied by replacing "petroleum" in my original suggestion with 
either Ute's suggestion of "contaminant" or Roy's suggestion of 
"total_petroleum_hydrocarbons", although I find the latter a little more 
specific, particularly if one were to envision a situation in which 
intentionally released dispersants were being tracked at the same time and also 
categorized as "contaminants".
As to the question of mass concentration vs. mass fraction, I am trying to 
represent the measurements of the SeaOWL UV-A sensor 
(http://wetlabs.com/SeaOWL), which appears to be calibrated in units of ppm -- 
and hence mass fraction seems appropriate.  The model that will assimilate 
these measurements is under active development, and may likely generate a mass 
concentration value.  So perhaps there ought to be both mass concentration AND 
mass fraction standard names.
Thank you,Mike Godin
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